cornerpiece ( cornerstamp )

1. A bookbinding finishing tool, usually ARABESQUE , designed
to be used at the corners of a leather binding,
usually for the purpose of matching a centerpiece
or other form of decoration. 2. Metal corners
attached to a binding to protect the corners of
the covers from damage. Removable pasteboard
cornerpieces are sometimes used to protect the
corners of books during shipment. (156 , 310 )